Apex Digital Pro MXR 90 - Performance Issues

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15
Engine starts but runs poorly
Exhaust system
Exhaust system clogged
Fuel system
Fuel petcock not fully opened
Fuel filter clogged or dirty
Air filter clogged or dirty
Carburetor vacuum leak
Carburetor main jet, pilot jet, or needle valve dirty
Ignition primary circuit
Poor connection of primary contact
Faulty ignition coil
Faulty CDI module
Ignition secondary circuit
Poor connection of ignition coil to spark plug
Faulty or damaged spark plug
Intermittent engine power
Electrical system
Poor ground wire connection
Poor performance at low idle
Bad ignition timing
Faulty CDI unit
Restricted fuel flow
Improperly adjusted air screw
Leaking intake pipe
Deteriorated insulator o-ring
Loose carburetor
Weak or intermittent spark
Loose or disconnected ignition system wires
Faulty, wet, or fouled spark plug
Faulty alternator
Faulty CDI unit
Faulty ignition switch
Faulty ignition coil
Broken or shorted spark plug wire
Faulty engine stop switch
Poor performance at high speed